Running out of IP Addresses

We are a company with multiple satellite locations and all are connected with WAN links back to corporate.  Our addressing scheme has been very simple
      10.1.1.x  255.255.255.0 Corporate
      10.1.2.x  255.255.255.0 Site 2
      10.1.3.x  255.255.255.0 Site 3
      10.1.4.x 255.255.255.0 Site 4
      10.1.5.x 255.255.255.0 Site 5
      etc.
The satellites don't have many devices...maybe 2 dozen and we've been working like this for 4 years now without any problems, until now.  Our corporate location has run out of IP addresses.  My first thought is to re-number the 10.1.2.x site to a totally different IP   and change the subnet at corporate to encompass 10.1.1x and 10.1.2.x, but I'm not sure what the subnet mask would be.  Also, I'm wondering is this the best idea?  If not, what would you suggest?
tparrettAsked:
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nociSoftware EngineerCommented:
You are still a bit in Luck....
10.1.0.x is still unused to if you make
10.1.0.0 255.255.254.0  the corporate spec the network can become twice as large.
Note you need to ADJUST ALL netmasks... on existing equipment.
And maybe you alo need routes changed on all satelite systems.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Add a second subnet for the main office.  10.1.7.x or 10.2.1.0

Or break things up - put printers on their own subnet. Put servers on their own subnet.  Put wireless on it's own subnet.  Etc.
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tparrettAuthor Commented:
noci - - I'm smacking my forehead on this.  I never even thought about the fact we weren't using 10.1.0.x.  That makes things so much easier.  Thanks for the quick response and great idea.
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